SAN DIEGO (April 16, 2021) Chief of Naval Research, Rear Adm. Lorin Selby, observes an unmanned vessel on Pier 12 during Integrated Battle Problem 21 (UxS IBP 21) Distinguished Visitors day at Naval Base San Diego. U.S. Pacific Fleet�s UxS IBP 21, April 19-26, integrates manned and unmanned capabilities into the most challenging operational scenarios to generate war fighting advantages. (U.S. Navy photo by Mass Communication Specialist 2nd Class Natalie M. Byers)